EP2705810A1 - Method to make a negative cast for articular prostheses, corresponding apparatus and cast thus made - Google Patents
Method to make a negative cast for articular prostheses, corresponding apparatus and cast thus made Download PDFInfo
- Publication number
- EP2705810A1 EP2705810A1 EP13183212.3A EP13183212A EP2705810A1 EP 2705810 A1 EP2705810 A1 EP 2705810A1 EP 13183212 A EP13183212 A EP 13183212A EP 2705810 A1 EP2705810 A1 EP 2705810A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stump
- disposable material
- deformable
- deformable disposable
- compressive force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/5044—Designing or manufacturing processes
- A61F2/5046—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, finite-element analysis or CAD-CAM techniques
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/78—Means for protecting prostheses or for attaching them to the body, e.g. bandages, harnesses, straps, or stockings for the limb stump
- A61F2/80—Sockets, e.g. of suction type
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2002/501—Prostheses not implantable in the body having an inflatable pocket filled with fluid, i.e. liquid or gas
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2002/501—Prostheses not implantable in the body having an inflatable pocket filled with fluid, i.e. liquid or gas
- A61F2002/5015—Prostheses not implantable in the body having an inflatable pocket filled with fluid, i.e. liquid or gas hardenable fluid, e.g. curable in-situ or cold-hardening casting substance
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/5044—Designing or manufacturing processes
- A61F2/5046—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, finite-element analysis or CAD-CAM techniques
- A61F2002/5053—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, finite-element analysis or CAD-CAM techniques using a positive or a negative model, e.g. casting model or mould
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/60—Artificial legs or feet or parts thereof
- A61F2002/608—Upper legs
Definitions
- the present invention concerns a method to make a cast from which to make an articular prosthesis, to be associated with the terminal segment or stump of an upper or lower amputated limb.
- the present invention also concerns an apparatus to make said cast.
- the present invention concerns a cast that bears the negative of the shape of the stump to which the articular prosthesis is to be associated.
- the negative cast in order to make articular prostheses, first of all the negative cast must be made, which is subsequently filled with a hardening material, for example plaster, or other similar materials, able to reproduce, positively, the shape of the stump in order to make a solid model thereof.
- the solid model is then used for the production of the articular prostheses, in particular to define the correct shape of the upper part, or socket, of the prostheses.
- the socket is shaped according to the solid model and, during use, surrounds and accommodates at least a terminal part of the stump.
- Methods which provide to make the negative cast by applying on the stump a moistened plastered gauze which is made to adhere to the stump and then made to solidify.
- the plastered gauze keeps the shape it assumes when it adheres to the stump and, after solidification, is able to reproduce the shape thereof in negative.
- One disadvantage of this known method is that, because the shape of the stump is taken when the patient is resting, it is not possible to make a socket with a shape suitable to adhere correctly to the stump under load conditions, that is, in conditions of dynamic use, not only static or resting. For example, in the case of prostheses for lower limbs, the dynamic load conditions occur when the user is standing, or walking or running.
- a sleeve or sock made of deformable material, such as silicon for example, interposed between the stump and the socket of the prosthesis.
- the sleeve or sock covers the stump and is intended to overcome the deformities and empty spaces that are created dynamically during use between the shape of the stump and the shape of the socket.
- the sleeve or sock has the disadvantage that it does not overcome the discomfort of prolonged contact between the soft parts of the stump and the rigid part of the socket. Consequently, despite using the sleeve or sock, the user must necessarily and frequently suspend his/her activity in order to rest.
- One purpose of the present invention is to perfect a method to make a cast for an articular prosthesis that allows to manufacture a prosthesis that can be used continuously by a user for relatively long periods of time, even a whole day.
- Another purpose of the invention is to obtain an apparatus that allows to produce a cast for articular prostheses according to the method described above, to obtain a socket with a shape as similar as possible to that of the stump with which it has to enter into contact.
- the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
- a method according to the present invention is used for making a negative cast of a stump using deformable disposable material, used for the production of articular prostheses.
- the method comprises a step of compressing the deformable disposable material that makes the negative cast during its molding and solidification in conditions where the anatomy of the stump is reproduced in negative.
- the prosthesis that can be obtained from the pre-compressed negative cast according to the present invention is therefore extremely comfortable to wear, and the user can carry out prolonged activity on his/her feet, even for the whole day, wearing the prosthesis thus made, without fatigue or pain.
- the present invention also concerns an apparatus to make a negative cast of a stump using deformable disposable material, used for the production of articular prostheses.
- the apparatus comprises molding means configured to cooperate with a deformable disposable material.
- the molding means comprise a containing element able to contain the stump which, during use, is located at least partly in contact with the defbrmabie disposable material which cooperates with the containing element to deform and reproduce the anatomical shape under load conditions of the stump when the deformable disposable material and the stump are subjected to a compressive force.
- the present invention also concerns a negative cast of a stump, made pre-compressed using deformable disposable material for use in the production of articular prostheses.
- a method according to the present invention is used to make a negative cast 10 for articular prostheses.
- a method to make a negative cast 10 of a stump 13 for prostheses for the lower limbs is described, using a deformable disposable material able to solidify and assume the anatomical shape of the limb, such as plaster for orthopedic use or similar or comparable materials.
- the new and original technical solution which obtains the above purposes and offers surprising and unforeseeable advantages, in technical terms, for the use and comfort of users, is based on the completely innovative idea, not deducible from the state of the art, of compressing the deformable disposable material that makes up the cast during its molding and solidification so that, once obtained, the negative cast is pre-compressed to the load conditions that are typical of dynamic use and is therefore comfortable, allowing prolonged activity.
- the method comprises a step of preparing an apparatus 11 comprising molding means 12, configured to cooperate with at least a deformable disposable material 15, 20 able to reproduce in negative the three-dimensional shape of a stump 13 of a user.
- the negative cast 10 is obtained by means of the molding means 12, in a subsequent compression step, during which the stump 13 exerts a compressive force distributed substantially uniformly on the molding means 12 and on the deformable disposable material 15, 20, deforming them.
- the deformation obtained during the compression step allows to obtain a negative cast 10 that reproduces the shape of the stump 13 under load, simulating a dynamic condition, for example as if the user were walking or running.
- the molding means 12 comprise a containing element or container 14, for example vase-shaped, and a deformable disposable material 15.
- the container 14, in this case, has an elongated shape, open at one end and closed at the opposite end by a bottom wall 16.
- the container 14 comprises support elements 17 that support it and keep it at a desired distance from a support plane 18. The distance must be at least sufficient to allow the bottom wall 16 of the container 14 to deform toward the support plane 18.
- the container 14 is rested on or attached to the support plane 18 and the deformable disposable material 15 is inserted inside it, in a quantity suitable to subsequently define the negative cast 10 of the stump 13.
- the deformable disposable material 15 is a uid mixture of plaster 15a and water 15b that is poured inside the container 14 before the stump 13 is inserted.
- the stump 13 is inserted after a certain waiting time, in the range of about 1.5 minutes, during which the mixture of plaster 15a and water 15b becomes more viscous and assumes the consistency of a plastic paste.
- deformable disposable materials having hardening properties, such as for example resins or polymer materials for orthopedic use, can be used instead of the mixture of plaster 15a and water 15b.
- the patient loads all his/her weight on the stump 13, consequently exerting a compressive force on the mixture of plaster 15a and water 15b, comprised between the stump 13 and the walls of the container 14.
- the compressive force entails a deformation of the mixture of plaster 15a and water 15b, which in turn exerts an equal and contrary compressive force distributed on the whole surface of the stump 13.
- the combination of the compressive forces allows the mixture of plaster 15a and water 15b to adhere perfectly to the stump 13.
- the loading of the user's weight on the stump 13 also causes the deformation of the bottom wall 16.
- This deformation is intended to allow a correct application of the load by the user who, forcing on a yielding surface, allows the stump 13 to assume exactly the shape that it normally has in dynamic conditions, such as for example when the user is walking or running.
- a rigid and non-yielding surface is not only uncomfortable and potentially painful, but would also modify the shape of the soft parts of the stump 13 which it comes into contact with, making it different from the shape normally assumed in said dynamic conditions.
- the compression step exerted by the weight loaded by the patient ends when the mixture of plaster 15a and water 15b is completely solidified and therefore the negative cast 10 is made.
- the stump 13 and the negative cast 10 are removed from the container 14.
- the negative cast 10 is therefore ready to act in its turn as a container for making a solid model of the stump 13: afterward, the socket of the articular prosthesis that is to be obtained is shaped on the solid model.
- the negative cast 10 thus obtained can be defined as pre-compressed and confers on the socket the correct shape so that it is able to distribute the weight resting on the stump 13 uniformly over its whole surface, in dynamic conditions of use.
- the molding means 12 in one form of embodiment, also comprise a lateral compression element 19, the function of which is to deform the container 14 laterally, narrowing it or widening it. This allows to modulate the pressure acting on the stump 13, respectively intensifying it or reducing it. A greater pressure on the stump 13 gives a greater definition of the negative cast 10.
- the molding means 12 comprise an inflatable casing 21, which acts as a containing element for the stump 13, and a plastered gauze 20, or similar flexible material associated with disposable material such as plaster, which has the same function as the deformable disposable material 15.
- the inflatable casing 21 in this case is made of flexible material and is provided with an internal chamber 22 to which to a filling device 23 is associated, for example a pump or a compressor.
- the filling device 23 is intended to make said inflatable casing 21 assume a first condition, not filled, in which it has a first dimensional bulk, and a second filled condition, in which it has a second dimensional bulk, bigger than the first bulk.
- the step of preparing the molding means 12 provides that the plastered gauze 20 is soaked to obtain a subsequent hardening, for example in water, so that it is soft and flexible, and so that it can be wound around the stump 13, to cover at least some of the terminal part 24 thereof.
- the inflatable casing 21 is easily maneuverable and adjustable to surround the stump 13 covered by the plastered gauze 20.
- the inflatable casing 21 is initially open longitudinally, that is, in the direction of development of the stump 13, and is closed around the latter to surround it.
- Two edges 25a and 25b, for example defining a tear-off closing, are overlapped to ensure the stable closing of the inflatable casing 21.
- inflatable casing 21 can be used, such as for example a casing defined by a closed and continuous wall that is fitted onto the stump 13 instead of wound and then closed.
- the compression step takes place, which provides that the filling device 23 fills, even partly, the internal chamber 22 with a desired quantity of a fluid, in this case air, causing an increase in the bulk of the inflatable casing 21.
- the increase in bulk is blocked in a circumferential direction by the overlapping edges 25a and 25b and therefore develops radially, that is, in the direction of the stump 13, compressing it.
- the function of the compression is to deform the plastered gauze 20 to make it assume exactly the shape of the stump 13. It is therefore clear that the inflatable casing 21 can also perform the function of the lateral compression element 19 present in the variant shown in fig. 1 .
- a pair of handles 26, associated with the inflatable casing 21, allows to exert traction on the latter, and consequently another load on the whole stump 13.
- the compression step ends when the plastered gauze 20 is completely solid.
- the inflatable casing 21 is returned to the unfilled condition, and both the stump 13 and the negative cast 10, consisting of the plastered gauze 20 which faithfully bears the shape of the stump 13, are removed from it.
- the molding means 12 comprise the container 14, the wall of which integrates the inflatable casing 21, with which the filling device 23 is associated.
- the method to make the negative cast 10 provides that the step of preparing the molding means 12 is similar to that provided for the variant in fig. 2 , and that the negative cast 10 is made by compressing the plastered gauze 20.
- the compression step provides that the user loads all his/her weight on the stump 13 inside the container 14, as in the variant in fig. 1 , and that the lateral compression is performed by the inflatable casing 21, filled by the filling device 23.
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Manufacturing & Machinery (AREA)
- Prostheses (AREA)
Abstract
Description
- The present invention concerns a method to make a cast from which to make an articular prosthesis, to be associated with the terminal segment or stump of an upper or lower amputated limb.
- The present invention also concerns an apparatus to make said cast.
- In particular, the present invention concerns a cast that bears the negative of the shape of the stump to which the articular prosthesis is to be associated.
- It is known to make articular prostheses starting from a negative cast made of disposable material, such as plaster, of the terminal segment or stump of the upper or lower limb, with which they are to be associated.
- In particular, in order to make articular prostheses, first of all the negative cast must be made, which is subsequently filled with a hardening material, for example plaster, or other similar materials, able to reproduce, positively, the shape of the stump in order to make a solid model thereof. The solid model is then used for the production of the articular prostheses, in particular to define the correct shape of the upper part, or socket, of the prostheses. In fact, the socket is shaped according to the solid model and, during use, surrounds and accommodates at least a terminal part of the stump.
- Methods are known, which provide to make the negative cast by applying on the stump a moistened plastered gauze which is made to adhere to the stump and then made to solidify. In this way, the plastered gauze keeps the shape it assumes when it adheres to the stump and, after solidification, is able to reproduce the shape thereof in negative.
- One disadvantage of this known method is that, because the shape of the stump is taken when the patient is resting, it is not possible to make a socket with a shape suitable to adhere correctly to the stump under load conditions, that is, in conditions of dynamic use, not only static or resting. For example, in the case of prostheses for lower limbs, the dynamic load conditions occur when the user is standing, or walking or running.
- This creates discomfort for the user, because a loose socket, or one that does not have an optimum shape, makes the prosthesis uncomfortable and sometimes even painful. This discomfort limits the continuous use of the prosthesis, when walking.
- In order to try to overcome this problem, it is known to use a sleeve or sock made of deformable material, such as silicon for example, interposed between the stump and the socket of the prosthesis. The sleeve or sock covers the stump and is intended to overcome the deformities and empty spaces that are created dynamically during use between the shape of the stump and the shape of the socket.
- However, given its limited thickness, the sleeve or sock has the disadvantage that it does not overcome the discomfort of prolonged contact between the soft parts of the stump and the rigid part of the socket. Consequently, despite using the sleeve or sock, the user must necessarily and frequently suspend his/her activity in order to rest.
- One purpose of the present invention is to perfect a method to make a cast for an articular prosthesis that allows to manufacture a prosthesis that can be used continuously by a user for relatively long periods of time, even a whole day.
- Another purpose of the invention is to obtain an apparatus that allows to produce a cast for articular prostheses according to the method described above, to obtain a socket with a shape as similar as possible to that of the stump with which it has to enter into contact.
- It is also a purpose of the present invention to obtain a cast for articular prostheses that allows to obtain a comfortable socket and that does not necessarily require to use a supplementary sleeve or sock, for example made of silicon.
- The Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
- The present invention is set forth and characterized in the independent claims, while the dependent claims describe other characteristics of the invention or variants to the main inventive idea.
- In accordance with the above purposes, a method according to the present invention is used for making a negative cast of a stump using deformable disposable material, used for the production of articular prostheses.
- According to one feature of the present invention, the method comprises a step of compressing the deformable disposable material that makes the negative cast during its molding and solidification in conditions where the anatomy of the stump is reproduced in negative.
- In this way, a pre-compressed negative cast is made, which reproduces the anatomical behavior in load conditions during dynamic use by the user.
- The prosthesis that can be obtained from the pre-compressed negative cast according to the present invention is therefore extremely comfortable to wear, and the user can carry out prolonged activity on his/her feet, even for the whole day, wearing the prosthesis thus made, without fatigue or pain.
- The present invention also concerns an apparatus to make a negative cast of a stump using deformable disposable material, used for the production of articular prostheses.
- The apparatus comprises molding means configured to cooperate with a deformable disposable material.
- The molding means comprise a containing element able to contain the stump which, during use, is located at least partly in contact with the defbrmabie disposable material which cooperates with the containing element to deform and reproduce the anatomical shape under load conditions of the stump when the deformable disposable material and the stump are subjected to a compressive force.
- The present invention also concerns a negative cast of a stump, made pre-compressed using deformable disposable material for use in the production of articular prostheses.
- These and other characteristics of the present invention will become apparent from the following description of some forms of embodiment, given as a non-restrictive example with reference to the attached drawings wherein:
-
fig. 1 is a schematic view of a first form of embodiment of a method and apparatus according to the invention; -
fig. 2 is a variant offig. 1 ; -
fig. 3 is another variant offig. 1 . - With reference to the attached drawings, a method according to the present invention is used to make a
negative cast 10 for articular prostheses. In this case, by way of non-restrictive example, a method to make anegative cast 10 of astump 13 for prostheses for the lower limbs is described, using a deformable disposable material able to solidify and assume the anatomical shape of the limb, such as plaster for orthopedic use or similar or comparable materials. - The new and original technical solution, which obtains the above purposes and offers surprising and unforeseeable advantages, in technical terms, for the use and comfort of users, is based on the completely innovative idea, not deducible from the state of the art, of compressing the deformable disposable material that makes up the cast during its molding and solidification so that, once obtained, the negative cast is pre-compressed to the load conditions that are typical of dynamic use and is therefore comfortable, allowing prolonged activity.
- In some forms of embodiment, the method comprises a step of preparing an
apparatus 11 comprising molding means 12, configured to cooperate with at least a deformabledisposable material stump 13 of a user. Thenegative cast 10 is obtained by means of the molding means 12, in a subsequent compression step, during which thestump 13 exerts a compressive force distributed substantially uniformly on the molding means 12 and on the deformabledisposable material - The deformation obtained during the compression step allows to obtain a
negative cast 10 that reproduces the shape of thestump 13 under load, simulating a dynamic condition, for example as if the user were walking or running. - In a first form of embodiment of the invention, shown in
fig. 1 , the molding means 12 comprise a containing element orcontainer 14, for example vase-shaped, and a deformabledisposable material 15. Thecontainer 14, in this case, has an elongated shape, open at one end and closed at the opposite end by abottom wall 16. Furthermore, thecontainer 14 comprisessupport elements 17 that support it and keep it at a desired distance from asupport plane 18. The distance must be at least sufficient to allow thebottom wall 16 of thecontainer 14 to deform toward thesupport plane 18. - During the preparation of the molding means 12, the
container 14 is rested on or attached to thesupport plane 18 and the deformabledisposable material 15 is inserted inside it, in a quantity suitable to subsequently define thenegative cast 10 of thestump 13. In this case, the deformabledisposable material 15 is a uid mixture ofplaster 15a andwater 15b that is poured inside thecontainer 14 before thestump 13 is inserted. - The
stump 13 is inserted after a certain waiting time, in the range of about 1.5 minutes, during which the mixture ofplaster 15a andwater 15b becomes more viscous and assumes the consistency of a plastic paste. - Other deformable disposable materials, having hardening properties, such as for example resins or polymer materials for orthopedic use, can be used instead of the mixture of
plaster 15a andwater 15b. - After the
stump 13 has been inserted, during the compression step as described above, the patient loads all his/her weight on thestump 13, consequently exerting a compressive force on the mixture ofplaster 15a andwater 15b, comprised between thestump 13 and the walls of thecontainer 14. - The compressive force entails a deformation of the mixture of
plaster 15a andwater 15b, which in turn exerts an equal and contrary compressive force distributed on the whole surface of thestump 13. The combination of the compressive forces allows the mixture ofplaster 15a andwater 15b to adhere perfectly to thestump 13. The loading of the user's weight on thestump 13 also causes the deformation of thebottom wall 16. This deformation is intended to allow a correct application of the load by the user who, forcing on a yielding surface, allows thestump 13 to assume exactly the shape that it normally has in dynamic conditions, such as for example when the user is walking or running. A rigid and non-yielding surface is not only uncomfortable and potentially painful, but would also modify the shape of the soft parts of thestump 13 which it comes into contact with, making it different from the shape normally assumed in said dynamic conditions. - The compression step exerted by the weight loaded by the patient ends when the mixture of
plaster 15a andwater 15b is completely solidified and therefore thenegative cast 10 is made. - At the end of the compression step, the
stump 13 and thenegative cast 10 are removed from thecontainer 14. Thenegative cast 10 is therefore ready to act in its turn as a container for making a solid model of the stump 13: afterward, the socket of the articular prosthesis that is to be obtained is shaped on the solid model. - The
negative cast 10 thus obtained can be defined as pre-compressed and confers on the socket the correct shape so that it is able to distribute the weight resting on thestump 13 uniformly over its whole surface, in dynamic conditions of use. - In the form of embodiment shown in
fig. 1 , the molding means 12, in one form of embodiment, also comprise alateral compression element 19, the function of which is to deform thecontainer 14 laterally, narrowing it or widening it. This allows to modulate the pressure acting on thestump 13, respectively intensifying it or reducing it. A greater pressure on thestump 13 gives a greater definition of thenegative cast 10. - According to a variant of the present invention, shown in
fig. 2 , the molding means 12 comprise aninflatable casing 21, which acts as a containing element for thestump 13, and a plasteredgauze 20, or similar flexible material associated with disposable material such as plaster, which has the same function as the deformabledisposable material 15. - The
inflatable casing 21 in this case is made of flexible material and is provided with aninternal chamber 22 to which to a fillingdevice 23 is associated, for example a pump or a compressor. The fillingdevice 23 is intended to make saidinflatable casing 21 assume a first condition, not filled, in which it has a first dimensional bulk, and a second filled condition, in which it has a second dimensional bulk, bigger than the first bulk. - The step of preparing the molding means 12 provides that the plastered
gauze 20 is soaked to obtain a subsequent hardening, for example in water, so that it is soft and flexible, and so that it can be wound around thestump 13, to cover at least some of theterminal part 24 thereof. - Once the
stump 13 has been wound by the plasteredgauze 20, it is inserted into theinflatable casing 21, when the latter is in its non-filled condition. In fact, in this condition theinflatable casing 21 is easily maneuverable and adjustable to surround thestump 13 covered by the plasteredgauze 20. In the particular solution shown infig. 2 , theinflatable casing 21 is initially open longitudinally, that is, in the direction of development of thestump 13, and is closed around the latter to surround it. Twoedges inflatable casing 21. - Other forms and types of
inflatable casing 21 can be used, such as for example a casing defined by a closed and continuous wall that is fitted onto thestump 13 instead of wound and then closed. - After the
stump 13 has been correctly positioned in theinflatable casing 21 the compression step takes place, which provides that the fillingdevice 23 fills, even partly, theinternal chamber 22 with a desired quantity of a fluid, in this case air, causing an increase in the bulk of theinflatable casing 21. The increase in bulk is blocked in a circumferential direction by the overlappingedges stump 13, compressing it. The function of the compression is to deform the plasteredgauze 20 to make it assume exactly the shape of thestump 13. It is therefore clear that theinflatable casing 21 can also perform the function of thelateral compression element 19 present in the variant shown infig. 1 . - A pair of
handles 26, associated with theinflatable casing 21, allows to exert traction on the latter, and consequently another load on thewhole stump 13. - In this way, during the compression step, before the plastered
gauze 20 has solidified, the pressure and load borne by thestump 13 in dynamic conditions is correctly simulated. - The compression step ends when the plastered
gauze 20 is completely solid. - At the end of the compression step, the
inflatable casing 21 is returned to the unfilled condition, and both thestump 13 and thenegative cast 10, consisting of the plasteredgauze 20 which faithfully bears the shape of thestump 13, are removed from it. - Another variant of the invention, shown in
fig. 3 , is substantially defined by a combination of the two variants described above. In this variant, the molding means 12 comprise thecontainer 14, the wall of which integrates theinflatable casing 21, with which thefilling device 23 is associated. - The method to make the
negative cast 10 provides that the step of preparing the molding means 12 is similar to that provided for the variant infig. 2 , and that thenegative cast 10 is made by compressing the plasteredgauze 20. - The compression step provides that the user loads all his/her weight on the
stump 13 inside thecontainer 14, as in the variant infig. 1 , and that the lateral compression is performed by theinflatable casing 21, filled by the fillingdevice 23. - It is clear that modifications and/or additions of parts may be made to the method and apparatus as described heretofore, without departing from the field and scope of the present invention.
- It is also clear that, although the present invention has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of method and apparatus, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
Claims (15)
- Method to make a negative cast (10) of a stump (13) using deformable disposable material, said negative cast (10) being usable for the production of articular prostheses, characterized in that it comprises a step of compressing the deformable disposable material that makes the negative cast (10) during its molding and solidification in conditions where the anatomy of the stump (13) is reproduced in negative.
- Method as in claim 1, which comprises, before the compression step, a step of preparing molding means (12) in cooperation with a deformable disposable material (15, 20), and in which said stump (13) is positioned inside said molding means (12), in order to make said deformable disposable material (15, 20) adhere to said stump (13), characterized in that in the compression step, after said preparation step, a compressive force is applied to said deformable disposable material (15, 20), comparable to the load to which said stump (13) is subjected in dynamic conditions, in order to deform said deformable disposable material (15, 20), so that it reproduces in negative the anatomical shape of said loaded stump (13), in order to make said negative cast (10).
- Method as in claim 2, characterized in that said compressive force is applied from inside said deformable disposable material (15, 20) during the definition of the negative cast (10).
- Method as in claim 3, characterized in that said compressive force is applied on the deformable disposable material (15) by loading the own weight of a user who immerses the stump (13) into the deformable disposable material and completely rests said stump (13) on the bottom of said molding means (12).
- Method as in claim 2, characterized in that said compressive force is applied from outside said deformable disposable material (15, 20) during the definition of the negative cast (10).
- Method as in claim 5, characterized in that said compressive force is applied on the deformable disposable material (15, 20) as a consequence of a traction exerted on said molding means (12) in the direction of the stump (13).
- Method as in any claim from 2 to 6, characterized in that said compressive force has a vertical component, acting on a terminal part (24) of said stump (13), and a horizontal component, acting laterally to the stump (13).
- Apparatus to make a negative cast (10) of a stump (13) using disposable material, said negative cast (10) being usable for the production of articular prostheses, comprising molding means (12) configured to cooperate with a deformable disposable material (15, 20), characterized in that said molding means (12) comprise a containing element (14, 21), able to contain said stump (13), which, during use, is located at least partly in contact with said deformable disposable material (15, 20) which cooperates with said containing element (14, 21) in order to deform and reproduce the anatomical shape in load conditions of said stump (13) when said deformable disposable material (15, 20) and said stump (13) are subjected to a compressive force.
- Apparatus as in claim 8, characterized in that said containing element is a container (14), supported by support elements (17) and having a bottom wall (16) able to be yieldingly deformed following the application of said compressive force.
- Apparatus as in claim 9, characterized in that said deformable disposable material (15) is a mixture of plaster (15a) and water (15b), having hardening and solidifying properties, to be poured inside said container (14).
- Apparatus as in claim 8, characterized in that said containing element is an inflatable casing (21), having an internal chamber (22) and associated to a filling device (23) able to make said inflatable casing (21) assume a first condition, not filled, in which said internal chamber (22) is substantially empty, and a second condition, filled, in which said internal chamber (22) contains a desired quantity of a fluid, in order to increase the bulk of said inflatable casing (21) and to exert at least part of said compressive force on said stump (13) and on said deformable disposable material (20).
- Apparatus as in claim 11, characterized in that a pair of handles (26) are associated to said inflatable casing (21) in order to exert a traction on said inflatable casing (21) and to apply at least part of said compressive force on said stump (13) and on said deformable disposable material (20).
- Apparatus as in claim 8, 11 or 12, characterized in that said deformable disposable material is a plastered gauze (20) wrapped around at least a terminal part (24) of said stump (13).
- Apparatus as in any of the claims from 8 to 13, characterized in that said containing element (14, 21) is associated and/or integrated with a lateral compression element (18, 21) able to exert at least part of said compressive force on said stump (13) and on said deformable disposable material (15, 20).
- Negative cast of a stump (13) made pre-compressed using deformable disposable material for use in the production of articular prostheses.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000151A ITUD20120151A1 (en) | 2012-09-05 | 2012-09-05 | PROCEDURE FOR THE REALIZATION OF A NEGATIVE WHEEL FOR ARTICULAR PROSTHESIS, ITS APPARATUS AND CALCO AS MADE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2705810A1 true EP2705810A1 (en) | 2014-03-12 |
EP2705810B1 EP2705810B1 (en) | 2017-02-01 |
Family
ID=47146553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13183212.3A Not-in-force EP2705810B1 (en) | 2012-09-05 | 2013-09-05 | Method to make a negative cast for articular prostheses, corresponding apparatus and cast thus made |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2705810B1 (en) |
IT (1) | ITUD20120151A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015106821A1 (en) * | 2015-02-26 | 2016-09-01 | Andreas Radspieler | Device for creating a plaster cast of a limb stump of a patient for manufacturing a prosthesis shaft, in particular for the lower extremity |
DE102016107074A1 (en) * | 2016-04-15 | 2017-10-19 | Andreas Radspieler | Apparatus, positioning device and method for creating a plaster cast of a limb stump of a patient |
DE102016110445A1 (en) * | 2016-06-06 | 2017-12-07 | Andreas Radspieler | Apparatus, set, system and method for creating a plaster cast of a limb stump of a patient for manufacturing a prosthetic shaft, in particular for the lower limb |
DE102016118765A1 (en) * | 2016-10-04 | 2018-04-05 | Andreas Radspieler | Device for creating a plaster cast of a limb stump with connector |
CN109481103A (en) * | 2018-09-29 | 2019-03-19 | 湖南海弘医疗科技有限公司 | A kind of artificial limb former takes type device |
US11090171B2 (en) | 2015-02-26 | 2021-08-17 | Romedis Gmbh | Apparatus, set and method for creating a plaster impression of a limb stump of a patient for manufacturing a prosthesis shaft and adaptor |
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US3520002A (en) * | 1967-11-29 | 1970-07-14 | Charles L Wellington | Artificial limb with an expansible foam stump socket |
US5503543A (en) * | 1994-09-29 | 1996-04-02 | Laghi; Aldo A. | Prosthetic casting machine |
US20040076700A1 (en) * | 2002-10-18 | 2004-04-22 | Kawamura Gishi Co., Ltd. | Amputated part holding apparatus and method for making mould of amputated part |
US7097799B1 (en) * | 2004-02-23 | 2006-08-29 | Burton Russell F | Prosthetic socket and method of making the same |
US20100115757A1 (en) * | 2007-01-31 | 2010-05-13 | Bernhard Sacherer | Device and method for producing an orthopaedic aid, and corresponding aids |
WO2013136284A2 (en) * | 2012-03-13 | 2013-09-19 | SAROTTO, Claudio | Machine for forming a cast of an end portion of an amputated limb |
-
2012
- 2012-09-05 IT IT000151A patent/ITUD20120151A1/en unknown
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2013
- 2013-09-05 EP EP13183212.3A patent/EP2705810B1/en not_active Not-in-force
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US3520002A (en) * | 1967-11-29 | 1970-07-14 | Charles L Wellington | Artificial limb with an expansible foam stump socket |
US5503543A (en) * | 1994-09-29 | 1996-04-02 | Laghi; Aldo A. | Prosthetic casting machine |
US20040076700A1 (en) * | 2002-10-18 | 2004-04-22 | Kawamura Gishi Co., Ltd. | Amputated part holding apparatus and method for making mould of amputated part |
US7097799B1 (en) * | 2004-02-23 | 2006-08-29 | Burton Russell F | Prosthetic socket and method of making the same |
US20100115757A1 (en) * | 2007-01-31 | 2010-05-13 | Bernhard Sacherer | Device and method for producing an orthopaedic aid, and corresponding aids |
WO2013136284A2 (en) * | 2012-03-13 | 2013-09-19 | SAROTTO, Claudio | Machine for forming a cast of an end portion of an amputated limb |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015106821A1 (en) * | 2015-02-26 | 2016-09-01 | Andreas Radspieler | Device for creating a plaster cast of a limb stump of a patient for manufacturing a prosthesis shaft, in particular for the lower extremity |
US11090171B2 (en) | 2015-02-26 | 2021-08-17 | Romedis Gmbh | Apparatus, set and method for creating a plaster impression of a limb stump of a patient for manufacturing a prosthesis shaft and adaptor |
DE102016107074A1 (en) * | 2016-04-15 | 2017-10-19 | Andreas Radspieler | Apparatus, positioning device and method for creating a plaster cast of a limb stump of a patient |
DE102016110445A1 (en) * | 2016-06-06 | 2017-12-07 | Andreas Radspieler | Apparatus, set, system and method for creating a plaster cast of a limb stump of a patient for manufacturing a prosthetic shaft, in particular for the lower limb |
DE102016118765A1 (en) * | 2016-10-04 | 2018-04-05 | Andreas Radspieler | Device for creating a plaster cast of a limb stump with connector |
CN109481103A (en) * | 2018-09-29 | 2019-03-19 | 湖南海弘医疗科技有限公司 | A kind of artificial limb former takes type device |
Also Published As
Publication number | Publication date |
---|---|
ITUD20120151A1 (en) | 2014-03-06 |
EP2705810B1 (en) | 2017-02-01 |
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